Improvement in beake foe yakn-beam of looms



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IMPROVEMENT I N BRAKE FOR YARN-BEAM 0F LOOMS.

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TO ALL WHOM IT MAY CONCERN:

Be it known that we, JOSEPH JOHN HARRISON and Eownnn HARRISON, ot' Broughton, Lancaster county, England, have invented an Improvement in'Looms'; and we do hereby declare the following to be a full, clear, and exact description oi' the same.

Our invention relates to an arrangement of mechanism for producing and regulating any amount of tension upon the warps without the employment of weights, and also for facilitating the operation of effecting such tension; and the improvement consists in encircling or embracing about two-thirds ofthe circumferences ofthe ends of the warp-beam with steel blades, chains, or other equivalents. The lower ends of these blades on each side of the loom are rmly riveted, or otherwise secured to a stiti' blade or coiled spring, fixed to the lower portion ofthe loom-frame.` Their opposite ends, after passing over the ends ofthe beam, are coupled with rods that connect them with a bar of metal running parallel with the beam, from side to side of the loom. The centre of this bar, midway betweenits extremities, is attached to a lever, the fulcrum of which is supported by abracket secured to the back rail of the loom, a little beyond where the lever is connected with the aforesaid parallel bar. The opposite extremity of this lever, at the side of the loom, is acted upon by a strong helical or othershaped spring, which can bc caused to increase or diminish its tension by means of a screw and wheel.

In order to enable others skilled in the art to make and use our invention, we will now proceed to describe its construction andoperation, reference being had to the accompanying drawing, which forms a part of this specification, and in whicht Figure 1 is an end elevation of an. ordinary loom with our improvement.

Figure 2, a side elevation of part of the loom.

Figure 3, a sectional elevation, on the line 1-2, iig. 1; and

Figure 4, a plan View of part of the loom.

A and A are the side frames of an ordinary loom, and ct is a lever which works on a stud, o, secured on the back rail e of the loom. At the end of the lever (marked b) a slot is provided, so as to allow a rod, z', secured to a bracket, to pass through and work freely, on which rod a spiral steelspring, d, is placed. The rod is screwed and provided with a hand-wheel, c, which, when screwed or unscrewed, exerts agreater or les`s pressure upon the lever a. l Achain,f, passes round each end of the warp-roller, is secured at one end to a spiral spring, Z, attached to the crosspiece e, and is connected at the other end to one end cfa bar, m. From the cross-beam m the connecting-rod g is suspended by ahook, which, after passing through a hole in the lever a, carries the two inclined-surfaced disks z' and f, the upper one of which is retained in its position with the lever a, by lugs or projections therefrom. The lower disk t is provided witha handle, as shown in the figure. The hand-wheel. on the connecting-rod g is for the rough adjustlnentof the tension on the yarn, and should be screwed up when the handle of the disk 7c is at right angles to the line of the lever a. When the proper amount of tension is obtained, the handle should be turned into a parallel position with the lever, when it will be locked bythe notches inthe inclined disk. When it is necessary to sla'cken the yarn, the disk c is turned at right angles, as above stated, which is easily done by the weaver without interference with the First and permanent tension obtained. 4

Theprincipal point to be observed in adjusting the tension-mechanism, is, first, to see that all parts are firmly attached, and secondly, that the lever a is in a horizontal position when the proper tension has been given forthe loom to work. The rough adjustment must in all cases be given by the hand-wheel. on the connecting-rod g. When desirable, a great additional power can be obtained by shifting the stud o to the, notch on the lever nearest the connecting-rod,

It will be seen that flexible bands may be substituted for the chainsf. We claim as our invention, and desire to secure by Letters Patentl. The chains or bandsf, bearing On the ends of the warp-roller, and secured to a bar, 711, in combination with the within-described deyices, or their equivalents, for adjustng-the bar, and securing it after adjustment,

for the pupose specified.

2. The combination of the above and the springs Z, connected to the bends or chainsf, for'the purpose described.

In testimony whereof, we have signed our naines to this specification, in the presence of two subscribing witnesses.

JOSEPH JOHN HARRISON,

EDWARD HARRISON.

Witnesses:

SAML SHELLEY, Ardwz'ck. WM. SWAN, A'rdwz'clf. 

